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Abstract

In situ spatial and temporal surface temperature profiles of CO2 laser-heated silica were obtained using a
long wave infrared (LWIR) HgCdTe camera. Solutions to the linear diffusion equation with volumetric and surface
heating are shown to describe the temperature evolution for a range of beam powers, over which the peak surface
temperature scales linearly with power. These solutions were used with on-axis steady state and transient
experimental temperatures to extract thermal diffusivity and conductivity for a variety of materials, including silica,
spinel, sapphire, and lithium fluoride. Experimentally-derived thermal properties agreed well with reported values
and, for silica, thermal conductivity and diffusivity are shown to be approximately independent of temperature
between 300 and 2800K. While for silica our analysis based on a temperature independent thermal conductivity is
shown to be accurate, for other materials studied this treatment yields effective thermal properties that represent
reasonable approximations for laser heating. Implementation of a single-wavelength radiation measurement in the
semi-transparent regime is generally discussed, and estimates of the apparent temperature deviation from the actual
outer surface temperature are also presented. The experimental approach and the simple analysis presented yield
surface temperature measurements that can be used to validate more complex physical models, help discriminate
dominant heat transport mechanisms, and to predict temperature distribution and evolution during laser-based
material processing.

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Journal of Applied Remote SensingJournal of Astronomical Telescopes Instruments and SystemsJournal of Biomedical OpticsJournal of Electronic ImagingJournal of Medical ImagingJournal of Micro/Nanolithography, MEMS, and MOEMSJournal of NanophotonicsJournal of Photonics for EnergyNeurophotonicsOptical EngineeringSPIE Reviews